Rotary separator



Jan. 20, 1942. E. E;.BERNARD 2,270,703

ROTARY S'EPARATQR Filed Nov. 22, 1939 Inventor Patented Jan. 20, 1942UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to rotary screens or separators and an object ofthe invention is to provide a device of this character particularlydesigned for separating rocks and foreign matter from dirt, gravel andthe like so that this finer material can be used in the construction ofroadways, drives, and the like; and the invention together with itsobjects and advantages will be understood from a study of the followingdescription taken in connection with the accompanying drawing whereinFigure l is an elevational view of the separator.

Figure 2 is an end elevational view thereof.

Figure 3 is a sectional view through the rotary drum, and

Figure 4 is a sectional view through the rotary drum taken at rightangles to Figure 3.

Referring to the drawing by reference numerals it will be seen that therotary separator, in the preferred embodiment thereof, comprises a pairof opposed bearing standards 5--5, which support therebetween a drivenshaft 6 the ends of which are journaled in the bearings of thestandards.

Mounted on the shaft 6 and secured thereto in any suitable manner torotate with the shaft is a screen-drum I that in the present instanceconsists of an elongated hub 8 on the ends of which are suitably mountedend plates 9. The end plates 9 are common to inner and outer cylindersl0 and II respectively.

The outer cylinder II is composed of a plurality of laterally spacedrings l2 of metal, wire, or other suitable material that are heldsuitably spaced from one another by tie-rods I3 the ends of which aresecured to the end plates 9 through the medium of pairs of nuts M asshown.

The inner cylinder II) is also composed of a plurality of rings of wire,metal or other suitable material that are closely spaced laterallyrelative to one another and are secured in suitably spaced relation fromone another through the medium of tie-rods I6 that are secured at theirends to the end plates 9 through the medium of pairs of nuts l1.

It will be noted that the rings I2 of the outer cylinder II are spacedfarther apart than the rings IS, the arrangement preferably being suchthat the rings I2 are concentric to alternate rings l5.

Also disposed on the outer cylinder ll intermediate the ends of thelatter is a continuous circular pilot track 18 that engages theperiphery of a pilot roller l9 suitably supported beneath the separatorthrough the medium of bearing standards 20. Obviously pilot roller l9and pilot track l8 cooperate to support the separator at the center ofthe latter. The track I8 has portions thereof connected with the hub 8by the radial brace rods 8'.

While any suitable means may be provided for revolving the separator,shaft 6 thereof is provided adjacent one end with a gear 2| forcooperation with other gearing forming part of a transmission mechanismfor transmitting drive to the shaft from a suitable prime mover orsource of power.

Also, suitably mounted at intervals between the inner and outercylinders l0 and II and extending longitudinally of the separator arebaffle plates 22. These bafile plates are arranged substantiallytangentially with the inner cylinder and prevent material coming throughthe outer cylinder from falling to the bottom of the space between thetwo cylinders which would clog the machine.

In actual practice the material to be separated or screened is picked upby a conveyor 23 and discharged onto the screen at the point indicatedin Figure 4 by the notation loading point. The receiving conveyor 44 isplaced adjacent the bottom of the device and to the left thereof and thedevice rotates in the direction of the arrow shown in Figure 4. Thematerial dropping upon the outer cylinder from the conveyor 23 tends tomove along with the outer cylinder but, of course, the dirt and smallparticles will drop through both cylinders upon the ground under thedevice. The large rocks will pass along with the upper cylinder andeventually drop from the left hand portion thereof upon the conveyor 24and the small rocks dropping through the outer cylinder will fall uponthe inner cylinder and such small rocks will pass around with the smallcylinder and eventually slide over the baffle plates through the largecylinder and drop upon the conveyor 24. As will be seen from Figure 4when a baffle plate reaches discharging position it slopes downwardlyand outwardly so as to direct the smaller rocks from the inner cylinderthrough the outer cylinder onto the conveyor 24.

As before stated this inventon is mainly intended for use in separatingrocks and relatively large bodies of foreign matter from dirt, graveland the like so that the finer material can be used in the constructionof roadways, drives and the like, with the large rocks and foreignmatter removed therefrom.

By providing the inner and outer cylinders with the rings of the innercylinder placed closer together than those of the outer cylinder, largeand small rocks are removed from the dirt and gravel with such dirt orgravel dropping through the device back upon the road-bed or othersurface and also by using the two cylinders there is less danger of theapparatus becoming clogged as the larger rocks are first removed fromthe material by the larger and outer "cylinder and the smaller rocksdropping through the rings of the large cylinder are caught by the ringsof the inner cylinder and removed from the dirt or gravel droppingthrough the device. By the use of this device the material is morethoroughly screened and with less danger of the apparatus becomingclogged than if but one cylinder was used instead of the two cylindersarranged and constructed as specified.

Having thus described the invention what is claimed .as new is:

1. In a separator of the .class described, a rotary screen horizontallyarranged and comprising inner and outer concentric cylinders, each ofsaid cylinders having a peripheral wall composed of a plurality oflaterally spaced rings, the rings of the inner cylinder being arrangedcloser .together'than those of the outer cylinder, means for:depositinglthe material totbe separated upon the outer cylinderadjacent the top thereof, means for rotating the screen in a direction'to cause the material to pass upwardly from the conveyor, the largeparticles being carried along with the outer cylinder and dropping fromthe same as the portions containing the large 'parr ticlesstart to movedownwardly, a conveyor for receiving the particles dropping from thelarge cylinder, the small particles droppingthrough the rings of theouter cylinder falling upon the inner cylinder which conveysthese-particles to ,a point where they drop upon the last-mentionedconveyor, finer particles dropping through both cylinders,circumferentially spaced baflle plates located between the cylinders andarranged substantially tangentially to the inner cylinder and eachbaflie plate sloping downwardly and outwardly at the discharge point ofthe device.

2. In a separator of the class described, a rotary screen horizontallyarranged and comprising inner and outer concentric cylinders, each ofsaid cylinders having a peripheral wall composed of a plurality oflaterally spaced rings, the rings of the inner cylinder being arrangedcloser together than those of the outer cylinder, means for depositingthe material to be separated upon the .outer cylinder adjacent the topthereof, means for rotating the screen in a direction to cause thematerial to pass upwardly from the conveyor, thelarge particles beingcarried along with the outer cylinder and dropping from the same as theportions containing the large particles start to move downwardly, aconveyor for receiving the particles dropping from the large cylinder,the small particles dropping through the ringsof the outer cylinderfalling upon the inner cylinder which conveys these particles to a pointwhere they drop upon the last-mentioned conveyor, finer particlesdropping through both cylinders, circumferentially spaced baffie plateslocated between the cylinders and arranged substantially tangentially tothe inner cylinder and each baffle plate sloping downwardly andoutwardly .at the discharge point of the device, a trackforming ringsurrounding the central portion of the outer cylinder and connectedtherewith, a hub passing through the center of the inner cylinder, bracerods connecting the track with the .hub.

ERNEST E. BERNARD.

